Polymer Tech

A AAS : Atomic absorption spectroscopy Ablation : Literally removal but applied particularly in space technology to the process of using up the frictional heat developed on re entry of the vehicle into the earth atmosphere by degradation of the heat shield. ACM :An abbreviation for acrylic rubber Accelerator:  A substance which fastenes the vulcanization of an elastomer,causing it to take place in a short time or at a lower temperature. Abrasion : The wearing away of a surface in service by mechanical action,such as scrapping or erosion. Abrasion Tester : A machine for determining the quantity of material worn away by friction under specified conditions. Abrasion Resistance Index :  A measure of the abrasion resistance of a rubber relative to that of a standard rubber under the same specified conditions, expressed as a percentage. Absorption :  The physical mechanism by which one substance takes up another substance (liquid, gas or vapo...

Tecnoflon® FOR 5351/U is a low viscosity cure incorporated fluoroelastomer copolymer. This grade has excellent flow and good compression set. Tecnoflon® FOR 5351/U can be used for molded items with complicated shapes which require a very good hot tear resistance for part removal. TECNOFLON FOR 5351/ U

U Cup Seals: U-Cup Seals or U-Ring Seals are commonly used in linear applications to seal the rod or piston.  Loaded U-Cups, Non loaded U-Cups, Hydraulic or Pneumatic U-Cups. The function of a cup seal, or U cup piston seal is to contain pressure on one side of a piston without leakage, and allowing maximum effort to be applied to moving the piston along the bore of a cylinder. It is also referred as lip seals, u ring seals are one of the oldest seal designs.  U cup have flared outer lips that work to create an exceptional seal for low pressure and low speed applications with consistently steady movement. U ring seals are often used for sealing rods and are simple to work.  The general material using for U cup seals are polyurethane.

Types of bridge bearing  1. Elastomeric Bearing a.Plain elastomer pads b.Laminated Elastomeric bearings 2.Sliding bearing Mechanism a. PTFE  sliding material b.Alternative sliding material 3.High load multi Rotational building: a.Pot bearing b.Disc bearing c.Spherical bearings 4. Fabricated steel mechanical bearing a.Rocker bearing b.Rocker cum rolling bearing Elastomeric Bearing: It consists of elastomer manufactured from synthetic or natural rubber and can take both translation and rotation movements through elastomer deformation. The ability of elastomer to carry large vertical loads is because of reinforcement provision that prevents lateral bulging of elastomer. There are number of elastomeric bearing pads classified based on types of reinforcements used. For example, steel reinforced, plain, fiberglass reinforced and cotton duck reinforced elastomeric bearing pads Strength and response of each type is different, steel reinf...

Elastomeric Bearings: Plain and Reinforced Plain, unreinforced elastomeric pads are used for short spans on which loads and movements can be accommodated by a single layer of elastomer. As vertical load and movement requirements increase, thin reinforcing plates are combined with multiple layers of elastomer to form a laminated reinforced elastomeric assembly . Steel and fiberglass reinforcement layers have been used; however, fiberglass is weaker, more flexible, and does not bond as well to the elastomer as does steel reinforcement. As a result, the use of thin steel-plate reinforcement has become more common. Neoprene is the most widely used elastomer, but some states also use natural rubber  particularly in colder climates, to meet AASHTO low temperature requirements. Natural rubber generally stiffens less than neoprene at low temperatures. Neoprene has greater resistance to ozone and a wide range of chemicals than natural rubber, making it more suitable for some har...

POT BEARING: The basic components of a pot bearing are a shallow cylinder, a pot, an elastomeric pad, a set of sealing rings and a piston. Pot bearings are fixed against all translation unless they are used with a PTFE sliding surface. The pot and piston are made from structural carbon steel, whereas the sealing ring is usually made of a single circular brass ring or a set of two or three flat brass rings. The brass rings are placed in a recess on the top of the elastomeric pad. Vertical load is carried through the piston of the bearing and is resisted by compressive stress in the elastomeric pad. The pad is deformable but almost incompressible and is often idealized as behaving hydrostatically, however, in practice; the elastomer has some shear stiffness. Deformation of the pot wall is a concern, since this deformation changes the clearance between the pot and the piston and may lead to binding of the bearing or to elastomer leakage. Rotation about any axis is accommodated by...